fixes #334 (DB refactor

	modified:   .gitignore
	modified:   app/models/database_adapter/database_adapter.rb
	modified:   app/models/information_providers/search_provider.rb
	new file:   config/DB_structure.yml
	new file:   config/mongo.yml
	modified:   db/script_db_adapter.rb
	modified:   db/seed.rb
	modified:   spec/models/database_adapter_spec.rb